Tube-number record
RS 523 / RS 723 / RS 823
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BrandTELEFUNKEN
ClassTransmitting Triode
BaseCoaxial
Construction
Primary TypeTriode
EnvelopeGlass-Metal
Base MaterialMetal
SectionsSingle
Filament / Heater
MaterialThoriated tungsten
Absolute Maximum Ratings
Plate Voltage12000 V
Plate Dissipation35000 W
Grid 1 Voltage-800 V
Cathode Current12000 mA
Audio Performance
Key Features
- Water cooling (RS 523)
- Forced air cooling (RS 723)
- Vapour cooling (RS 823)
- Concentric grid ring
- Directly heated cathode
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| RF Amplifier Class B | 10000 V | 30000 | 1420 | 52 | 4200 mA |
| RF Amplifier Class C | 11000 V | 30000 | 1250 | 52 | 4750 mA |
| Anode Modulation (Carrier) | 7500 V | — | 900 | — | 1750 mA |
Application Notes
Precautions must be taken to ensure tube flash-overs are limited to Q < 5 As and discharge time < 100 ms. Mounting position: vertical, filament terminals to the top.
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